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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef6c3ccffe08ac88017efe5cfb2c6e54ff5973747d290b8ca044560c4d316e5' 
  AND token = '8tXVoRMhoyfT+NER/MEGIlI+U5r01p+O1QRPZYytiC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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