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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97afadae91066751ee6fe93b4fb5cd3c22f411da1f033b6ca7b38c9842569c96' 
  AND token = 'Jf2Yz7BDeCQDm6v9bgGDLV2WjAkKfqcyy2uDoLE/2dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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