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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205b464b0b88b05efd38d7cc5a348bca858ab53af1f6b7861599ce5b14dbd9ab' 
  AND token = '7gwrxVcVB9gpPpN6U5oSn01Fx4duLboSSmow8fTSJ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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