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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b01e94db339badd1a34a441307b6549431bf33a96b1fe1a5c780580d4c80d7' 
  AND token = '0jT3cwPfqNO43ku8JjyJYt8064kQ1saMsO9j9AJ9XVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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