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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f313f36b507b2b54d649a9863024e6b53e9e3b155800def7b038049724345b' 
  AND token = '3WEqFP2GdxkX+sgT6NanAKGh/aw+cApJnQIHT3duo9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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