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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62e2e09a14da07083d48849620a816cf0f3a9274eb68ea269baa5e932d145a7' 
  AND token = 'YHtl2XJMq8m1bKyo2sPsev+/jhckgEzpqJrF5Hcn0Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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