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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '500d8b280cd58e9e545a06ea6e11d5136a470c909e17b098590a5ebc887c9d1a' 
  AND token = 'kKj7L4Tz6E615LkB762rFOv0fe1cjPU9E42If4Ajzlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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