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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc31d365610434e42ba39ba0acf5db59a13e5a89d0e9c4b0ab4fd12ec83df65' 
  AND token = 'QVIp8SiNlTF3BKkpk6RzkGBGdAqyA6IX9APmnpXd+rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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