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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1cbcd52cb7d565ee7c156113e7e0cda6a3a4208c13cdd6c0a6a399ea3bb1d73' 
  AND token = 'E0pVWSNp1HWljYEA/VsiYIpsak9sT/uwwh2l8qOuBwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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