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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9c6d1a298b557e3fd0194155bc707606c6b91bcc3dfce148152cba88a3652b' 
  AND token = 'Y1kObFcecHJ7W6lSj6IzkWm2H20Ej5lYnleeoIdB28E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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