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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de96c504b109bca3f719f64a5ae2cf91fe3781a0c9edb0c43136302fab2eb56' 
  AND token = 'vFpEq2VgaZsPwS4z4I2G1ingtQETfFkpu23e4ari2qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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