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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a237769d592f25a2e52912abf494252a2d6687a9420745f6025d1bd4933a2c8' 
  AND token = 'UzMSrXWLnSm/2V+Hm1p49J5StaWXHL8/diLHQHfJUos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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