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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56da29e1dd562c2f20d70f88784a61aaf0e7a1491ea6b772e0ae67a025c0e23a' 
  AND token = 'iQVUrqiMihO/tk9cTX1qA7jUlaWVxrOjctkIt3sS9tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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