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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83495857e568d24e07dd36f1919fe65e48d57822a02d6427f62bcc2b5bff625' 
  AND token = 'wEPlZEXKMZa356CVROPajo2+xej0xc2tKTPAYK7NQiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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