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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a338a1fcabe5ef38a34788b463773b523c1a1ae04b3f6db20285117e7f7db94d' 
  AND token = '3WeJteyeAIah6Vp6UC3XjzhE+B9atZQWxZPd8X+08Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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