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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ac046ef493147b46d678df25d29ce4231c06a7351446e5c6f7a2ee676bf8a8' 
  AND token = 'eN2mhFXlLgiO7fXhfYXfokJGYGhxVlhrj4wIrhBsW6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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