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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32029be6554405c72ab76d7d3153ae1710ea6616e224db1d930b9ec868779ef0' 
  AND token = 'f6oQGfUX4Fd0qlfD4zkGO1ZqM+gQJQb1mg9QEBA9Xo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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