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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd856332b338d24c8cbb97c4742acc0ffc16d3431e3c5dbb20c72a29c242a69d1' 
  AND token = 'jOVUNRm0EsGegiaDrDeeudHAh34EC6pFQpoI6tuwTxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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