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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa67755a0a3a3be7d1dfb9e9d004e3f17f27790f301ddf302148e8705f65734f' 
  AND token = 'FJycbsVej6cJu5IL7os/5P+5HePnhggV3fSp0ezi6oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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