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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049ebd6df36d0d11256662d74dc39d00e8f612d996e78eb0ba1b56ab3603bc38' 
  AND token = 'kkvtrMhS5GhCsSsHxzO+IIzLk/hNnXsSRQpTQVVYvMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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