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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4e2a6c42e79a048b448ab533f425894270c708c0addf89f1f582f5dc7d5e24' 
  AND token = 'nUqjISwx5kvXw3hKD1e3JsYxlJ25078WFqVDMYvFhk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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