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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c71c26ecd64dfa8c9aee1bd0ae1b5b97b6c0611ee996971e7d644f4929179ca' 
  AND token = 'UjZGSuSE9IiML9zxVJQXOM21FMVp+KJ39M9FdC2UZHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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