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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff8d9bee98f48fb6a6e855cf685659b8f7bd6623711fae781f52c1ee084ebd4' 
  AND token = 'Ct/IuU7qJVWxGqKKLMGal1pj511+bNTIE/AndDwlW5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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