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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e520f83def5cc7228c72fcdc32d25df6a518ac4bf090c1d8c501628ec765675a' 
  AND token = 'skb2S2qFQqWhT14I0UNKyfhPPZKLF8IK+vWmXnubdGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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