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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ade78a2a9313376ead63006fb1ef2d79fd7d6023138040a3e411371b8e7203' 
  AND token = 'Su0Qrb9qGhInR4y1jFaChioEdlc/z6CnHlC9LN5pEHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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