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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3301320743e37e37b048107c1aa555382a77713a4baba6c232816b16ab7c5452' 
  AND token = 'VWesqo9HUGr8T/BxlhaovAbdY7spvqqut4w+eJSnfU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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