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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e305e56f49f3c4c579ca0b979c39e428769a23a72b54624a094c58ea9dbe189' 
  AND token = 'N11IOrItcyGBJOYkIZ/p6Fo28TLgyBWE1oJekCHknsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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