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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5976be60417051c14f24adc87a64dd1a5403725453bbf5699f6fafa4cb592de0' 
  AND token = 'g6IWM5nXfCqCJLUSeea4u9IpkNZjBad8+Zaem/Jv3O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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