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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2240dd74aace097964e5db32ec2e3eec612bdd28ab2effc093d296119036a26c' 
  AND token = 'bsuq89FDgmvhkepJAScKGo87M5eH1JmDahKUzaKenk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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