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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1660a3e645ced5c49d1269fe6f05af4508431867f56547b7e7e7a9538f11c97' 
  AND token = 'lzQ09hnaVUFHOaJ6GQv73WvkS0pnZFknbcr9mApgJm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}