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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff47cb9c703891f13ba6470f0d119b5f0e38f041da4b88de52292c9441bda7c' 
  AND token = 'bvKL6k6WVtEtLkNVCsyv3qhDkDnRwTv1wBQvG0elrkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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