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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc610705581eb8b270716fec0871a7de095cd31d5c7813fda06449dbb895a942' 
  AND token = 'M761Kpox4thyp1jQnffGErskc+qIA7Rum4opFyIJjT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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