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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef46eca3bfe0b4bb592a7d9af6004ab54b62a3ca179aede3de688dc1e0a3364e' 
  AND token = 'JahC9oqyXiGtJ26QawKttFk/XfR3xT6/vMeLDjq5Wv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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