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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcfdff9e570fdecf1f969bd0fdced2daa45d08c0f05f82bbaabf3774e413781' 
  AND token = 'XsrD0LgKwDO2g1NuV+QrcNPebGPN3c/wxr2fkiZirHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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