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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867c8d8642d5d2aae6d671b94d6b28ffe35dc929c5c8d38376aae1e3928e2b02' 
  AND token = 'jDxhxmJD8ESLHZzemj9655YEpJJa/XIi2ptnDwbZD4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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