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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56d30f2d2e6cfbc6ab15ffcc89660f6ed3f1fac8c2d89009d0cc873786b8729' 
  AND token = 'wFPa6u7LdPKu4zbz1CVeYn2QGtRQFKdYAm2WgMirUaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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