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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ae315d0c3504ee25c2b04a5e76923a5df753ee451f3c647fe2c3faad500069' 
  AND token = 'RlTP9pBg9CvGXmSFVo2bpoMtBVNlE0mFCiaERkHJYgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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