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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5998ddf3ef6629ac6d3428099b1614af23c37c5d82812e697a9a85c902fdf792' 
  AND token = 'F1Gyod2Bc4Jdx+aYEJ5TrsJ+8hE3813R8E4BZ7KZZUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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