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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9851433e35ab991d2e60cc3f03a4bd883f80ccd1c33260f8a66da9ac11671279' 
  AND token = '8BTbY3YN8AI3y50InXGbWm2u0JMCCp5ReSVvIPYogSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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