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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b007d45940e090af1873383576b17711b9f9350f49a320fa55f0bb0efa92a9' 
  AND token = 'ucyqXMmASm47eEPwOhA1NtcVoKcUt8jeGDWwKF90szE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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