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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957d2435807f91bb2aa6dc1b86ffe90d641d4b3639e4e07532e9578335333dce' 
  AND token = '7xBV9fcbDw/vxjqQhv82b+0cPdZiUda8sjGFiyck9PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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