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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e424c4db5f7b4a386256deb445e10faed5dc5b3331508a57fcf9d36feaaf7ac' 
  AND token = 'YJG6WmheAWNojrPTtg6lLV0HJK37X/Ommipne1p4JQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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