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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78dc6bb54ae27cbac33cacad0ec854a9e81259b661da9466e182c3f4d251ee5' 
  AND token = 'juaXQ3d890oxBfBBmBSvWsOaGMJ+a0mUdyVFmgKut3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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