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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead8b34fc0f3db68e6029f689067249ca73422b8588d2456b90ec8348692f284' 
  AND token = 'OE6r0jVjeUaeDcE2t78OE/msdSSq2hhF2z6XCrUE+do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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