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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ab8cb771d3db055d7ece5a2f18dd8935f866211405878ac7084d8753cc6808' 
  AND token = 'BmbuIRNTGZP/fuqkUy5O0bmUffdJCmsJUkL0yp2Dqjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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