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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e973230aef8a07d69f263527cab1f08b5c546a930239ef48947cd9fecf33c0' 
  AND token = 'rO19u86EaaWdpmTfIlxGs3JCywRcbbg8rDr+NiUiqlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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