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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51979117b5cac7923a268cdb56296ba18d60837cc9b5b3e234f43fc3843464e9' 
  AND token = '1Qr5mYUb0kdm9qotE/TNGIgr/Wb8DhIS61AzkaS6nto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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