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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb184f426b111c212574d73226f31f61c97a063a9d55b0765e93cd131813ee8b' 
  AND token = 'Iq8LShnOdI6jQtomgEUAxzFNkPMAuzziK9kcfXeMBNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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