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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ce2f642d8c443311dc092d007006a623f5f6af353d40e05a53970fc5d9c171' 
  AND token = 'XCXdg0VmYmfHAMd1RVCQTEOYiEuG6uvByTvyCSZCbd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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