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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14f354f2ebb6e774340464c73e6db8a6889486c05627f67345cc03c831293c4' 
  AND token = '9RS4tNjCSPJbf46NJ76Ws7sJ1K24sh/fIwIDWXaHKOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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