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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fffe43b9cc900cdf6062c6915d2bce296e885b4ddf04b83954730aefc18a71' 
  AND token = '7nG9dl9IHp6ceRxmD+4c2RTKpw0dpPOO0A8I+nza2zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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