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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5536675e09e9e8d585699fa565ccee80a4af6aa7ad682fb345158e1a336ec7b' 
  AND token = 'Uye1wf/EDj5kyioIsJKoxI+Wx3Lh7bvNsDKwwdXTFsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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