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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b199843bfa222eb7919bf2548aa803869f9a5bd78a9e43a2f5f9f16d251ce8f9' 
  AND token = 'SgUDdRgbQ9P5fZm4bG2ZxDagRp2RBczQy3BRHLzsUZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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