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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59e8c2f6d17d5585946ddd566f1782e174cf7f87a589afc6054def96e793ae4' 
  AND token = 'JI+QyCdhBI/v3AHHhbOC1yq7U+k7DXexsUaCAIPPIg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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