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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f77f62a616366e16520a7e3a5361b06fef95ba04de2b706ba02c29c108f2fb' 
  AND token = 'yEN/4S/14m2FDfbaEP5v7TrCBUk1aX9YtxOE+aA+bKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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