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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41713f0870cb9fde22b73f658e1918233750d3835152c2e1dec382cf130958d9' 
  AND token = 'rDF/1G61fv0jn9f9IKrUHqZZ+nyfQwJYPDdXRrgp0KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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