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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fe5b9483913e40f9292a9ae0f21992247ce16f441be852d5816c992a4ff349' 
  AND token = 'M5MtBYmFP2OP9SZlPsnZzedaeUoQFCqFCOj8sMBvabw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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