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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d884e9ca1f2baa95009afd9cfc8abfab46a10e6e49333fc50129d09ff5d2147' 
  AND token = 'Pbgbb14Q0CLzqNGj1JZ6vi3IuvueUoORksN62K38shI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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