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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64085ba874310669bcce7010c7c4e351cb8ec9a8bde959d0cc3505ae2317241d' 
  AND token = 'kRmKOgNcDvma4hwjdfAhFMIhgznU+URAjWRNOIm9p6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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