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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37cbe945364b3d0625e232cfdd56fd7b67b56ea0f58380e3b92c107edbec203' 
  AND token = 'n2e5D3NJ/qdFIJu+VGOFzny9Kxp/icqoYs7XW3H4e1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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