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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa14dfbc19430cdefb3f1db5ebfdb5477747091bee5d78c8a459e87c29590a0' 
  AND token = 'TFcZkQFM049UuylP//frYlQaYWD14Vzcd31Z11d3iWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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