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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1128607bef060d349e5de7a3dfaa60529418a67689509efe25f24f9ab4e7de' 
  AND token = '2wbiCRQW6RE8j23HU7qYzql5hEtZpdVpipW5dDsoxMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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