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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce5c48de1d7a33da9941e9be39e228c9987cc9c7a8277c51bef71e1c84394fa' 
  AND token = '0bzE5IGfMwvVZQ35MuLwshCHZeM8tDH2MEk3A9Nd02k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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