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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b506a90bd1c849cba7cb10727897c065b72745b49cb9af393e75b27ddcea918d' 
  AND token = 'TcGstLS5DZUX5gcisuj6V35gT43P74ZG+2TrrFErZ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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