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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c9a5ad2ba1bbdcf8e51a5ce4919d8bd2d875541d64f54a551684bcd04a67f5' 
  AND token = 'U1kpN3JA7zGnjLxT1EsRB2N4iNW7bIC4PS8szASU004=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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