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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb988e9254bb38156b1497487302da3aca18ef737c1a9faa2056f92ceb7872d8' 
  AND token = 'oTxGVcGhHqU1Rdrg974L4urRtbpSCpo8gb7WD7bdGjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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