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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da08980003126621b8a6109c754116b2e8dc96ef9cfaeef1075424007bd00ea' 
  AND token = 'VwkaL+el+omrHYikIWH7QWZescg7j8oUnOTbJczrZnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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