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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9771d3729e24b184d3e7e9558db42d87ba20757545403814f82861e16acc381' 
  AND token = 'WLbcLQeFtpsaVdNTmV5a/isNaqnh3g372n0vIK0s3p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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