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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20adffa411f67f135e7af09ab003795f7a828a882fa3162b134f50f4cd9789fb' 
  AND token = '5OvK7in2ArzXQPnEvPFSQbJumFloMmLmuGfo5EEeKFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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